Nintendo Switch Lite Manual page 5

Note

It takes approximately 3 ½ hours to fully charge the Joy-Con controllers.

The Joy-Con Charging Grip (model No. HAC-012) is not included in any Nintendo Switch bundle.
This product is sold separately.
Inquiries About Leaving the Nintendo Switch
Console Docked
Applies to: Nintendo Switch, Nintendo Switch Family
The Nintendo Switch console can be left in the dock while not in use to ensure that it is fully
charged.
If you put the console in the dock or plug in the AC Adapter directly to charge before the battery
is completely spent, it will only count as a partial charging cycle.
Leaving the console on the dock or plugged in directly with the AC adapter overnight, or past the
point where the battery is fully charged will not cause harm to the battery.